Preparation method of heterosite iron phosphate and application thereof

A preparation method of heterosite iron phosphate, comprising the following steps:

• (1) mixing lithium iron phosphate with a solvent to obtain a slurry, adjusting the slurry to an acidic pH to obtain an acidic lithium iron phosphate liquid;
• (2) adding a transition metal additive to the acidic lithium iron phosphate liquid to obtain a mixture, performing leaching in an intensifying micro-environment to the mixture, followed by filtration to obtain the heterosite iron phosphate and a lithium-rich solution;
• the leaching in the intensifying micro-environment is to leach iron phosphate out of the acidic lithium iron phosphate liquid with microbubbles or under controlled pressure;
• wherein the microbubbles are produced by introducing a gas into the acidic lithium iron phosphate liquid;
• the controlled pressure increases the oxygen oxidation potential by changing the partial pressure of oxygen in the leaching environment;
• the microbubbles, or oxygen microbubbles/dissolved oxygen produced by the controlled pressure generate hydroxyl radicals under surface catalysis of the transition metal additive, used for improving the oxidation capacity and oxidation reaction rate of ferrous iron in the lithium iron phosphate liquid.